Katie Taylor’s defence of her Olympic title has ended at the first hurdle after defeat to Finland’s Mira Potkonen on Monday.
The Irish fighter won gold at London 2012 but was abruptly sent packing from Rio after a split decision count-back went against her in the lightweight quarter-finals.
The verdicts were 39-37 38-38 37-39 meaning one judge gave the result to Taylor and another scored a draw, so the Olympic count-back ruling was brought in to deny the champion.
Taylor was handed a bye in the first round meaning her debut in Brazil would have earned her a minimum of a bronze medal if she advanced past Potkonen.
Taylor (right) was often caught with her guard down
The reigning champion was ahead on the judges' scorecards after one round but Potkonen roared back, frequently making Taylor pay for her lax defence with an accurate right hook.
Two judges favoured Potkonen heading into the fourth and final round and, despite Taylor remaining competitive until the final bell, she couldn't do enough to avoid elimination.
"I thought I had the fight won, but it was a close fight, and congratulations to her," said Taylor. "But I should be really beating those girls."
Taylor's loss continued an awful Olympics in the ring for Ireland. Michael Conlan is the last Irish fighter left from the eight who made the team. He fights on Tuesday.
Charlotte Dujardin claimed a gold medal for Great Britain after successfully defending the Olympic individual dressage title.
The 31-year-old set an Olympic record Grand Prix freestyle score of 93.857 per cent on Valegro, pulling clear of her nearest rivals, to add her third Olympic gold medal.
Germany's Isabell Werth finished second on Wiehegold and her compatriot Kristina Broring-Sprehe took the bronze with Desperados, while Britain's Carl Hester finished seventh on Nip Tuck.
Charlotte Dujardin claimed a gold medal for Great Britain after successfully defending the Olympic individual dressage title.
The 31-year-old set an Olympic record Grand Prix freestyle score of 93.857 per cent on Valegro, pulling clear of her nearest rivals, to add her third Olympic gold medal.
Germany's Isabell Werth finished second on Wiehegold and her compatriot Kristina Broring-Sprehe took the bronze with Desperados, while Britain's Carl Hester finished seventh on Nip Tuck.
Dujardin's score was comfortably higher than her gold-medal winning tally at London 2012, which was also set on Valegro, and was her third highest of all-time.
The Gloucestershire-based rider joins eventer Richard Meade as the most successful British Olympic equestrian rider with a hat-trick of golds.
Dujardin recorded her third highest score ever in Rio
Dujardin, who holds all three of the sport's world records, confirmed that Valegro is likely to be retired later this year.
"I knew he couldn't have done any more," she said. "It is really emotional.
"It is on the cards he is going to retire, and we will go home and make a plan.
"I went in there to enjoy it and give everything. He really looked after me in there and helped me.
"He is so magical. I can't even tell you what it is like to ride him. He has a heart of gold."
Simone Biles' bid for a record five women's gymnastics gold medals in Rio has ended after the USA star came third on the beam, with Sanne Wevers of the Netherlands securing victory.
It was the first time the 19-year-old has been beaten in a final since 2013.
Wevers took gold with 15.466 points ahead of American Lauren Hernandez, who claimed silver with 15.333.
The Dutch gymnast finished runner-up to three-time world all-around champion Biles on the beam at last year's world championships.
Despite getting off to a strong start, Biles put her hands down on the beam after landing a front somersault.
Biles was marked down for touching the beam while landing a somersault
But the Texan still has a chance to secure a record-equalling fourth gold when she competes in Tuesday's floor final.
Soviet gymnast Larissa Latynina (1956), Czech Vera Caslavska (1968) and Romanian Ecaterina Szabo (1984) are the other gymnasts to have won four gold medals at the same Games.
A canoe slalom coach from Germany has died after sustaining head injuries last week in a car crash in Rio de Janeiro, the country's Olympic team has confirmed.
Stefan Henze, who was 35 and won a silver medal in canoe slalom at the 2004 Athens Games, died surrounded by his family, the team said.
"We know that Stefan's own Olympic thoughts live on in many people," Henze's family said in a statement.
Henze had been in a Rio hospital since undergoing emergency surgery following the taxi accident on Friday.
"Today the sport which the whole team came to Rio for recedes into the background," Germany team leader Michael Vesper said.
"Our thoughts are with Stefan's loved ones, who had the opportunity to say goodbye here."
Sports scientist Christian Kaeding was in the taxi with Henze but suffered only slight injuries.
Germany will commemorate Henze's death in the Olympic Village on Tuesday and the country's flag will be flown at half-mast at all Olympic sites in Rio.
IOC President Thomas Bach described Henze as a "true Olympian"
"The IOC is mourning the loss of a true Olympian," IOC President Thomas Bach said. "Our sympathy is with the family of Stefan Henze, his friends and all of the German Olympic team."
Germany's canoe slalom team posted a black and white image of Henze on its Twitter account.
"We are deeply sad," read an accompanying tweet . "Rest in peace, Stefan. You will stay in our hearts forever."
France's Renaud Lavillenie has expressed his disappointment after he was jeered by the Rio crowd whilst competing in the final of the Olympic pole vault.
Lavillenie, the defending champion from London 2012, was beaten to gold by home favourite Brazilian Thiago Braz da Silva, who achieved an Olympic record of 6.03 metres.
He likened the treatment he received from the partisan crowd to that of the experience of US athlete Jesse Owens had during the 1936 Olympics in Berlin.
"In 1936, the crowd was against Jesse Owens. We've not see this since. We have to deal with it," he explained.
An increasingly vocal crowd whistled and booed the French athlete as it became apparent Da Silva was in contention for a medal.
Jesse Owens won gold in front of a hostile crowd at the Berlin Olympics in 1936
Lavillenie lamented the "nastiness" of the crowd and suggested those who joined in the jeering should have stayed at home.
"Better to stay at home in front of your television than come and whistle," said Lavillenie.
"At least then we'd have people in the stadium who want to watch sport.
"It really disturbed me, I felt the nastiness of the public and we do a sport where you never see that.
"I completely understand that the Brazilians are behind Thiago, that's totally normal. But what is not normal is the total lack of respect for the rivals. The least thing, if you don't like someone, is to ignore them, but not to insult them. Because I took that as an insult.
Thiago Braz da Silva won Brazil's second Olympic gold medal
"It's horrible to see that at the Olympic Games."
Preparing vaults on the run-up, Lavillenie appeared on the stadium's big screens, to increased booing.
He greeted the jeers with a wagging finger and then a thumbs-down, to even more whistles.
"In all the competitions I've taken part in, even where the local athlete was going for something, the public has never ever whistled the athletes. It's incredible," he said.
I understand that they don't encourage them, but it's not football, it's the Olympic Games which has an enormous sporting influence, it's not every year it happens, and I think the crowd spoilt the experience for a lot of pole vaulters tonight.
"It's the first time I've experienced this type of crowd. It's the first time they've been against not only me but all the other pole vaulters except the Brazilian guy.
"There is no respect, no fair play. It's the Olympics, if there's no respect in the Olympics, where can we get respect? I'm very, very sad and disappointed by the Brazilian public that was in the stadium."
The judging of Olympic boxing in Rio has come under fire in the wake of Evgeny Tishchenko's heavyweight gold medal.
Russia's Tishchenko was awarded the decision over Kazakhstan's Vassiliy Levit in the 91kg final - but after widespread shock at the judging of the bout, the following medal ceremony produced the bizarre scenes of an Olympic champion being booed.
Some of the refereeing as well as the judging has already come under scrutiny, but it was the scoring of Tishchenko versus Levit that inspired some of the sport's big professional names to take to Twitter and voice their concerns.
Shane McGuigan was critical of the decision in the heavyweight final
Here's a canvas of opinion...
Shane McGuigan (world champion coach): "Boxers spend 4 years training for these championships, to get robbed after 9 mins. I've seen 20+ wrong decisions."
BJ Flores (world title challenger): "No question. Levit won all THREE rounds. Impossible to give Tischenko two rounds. Impossible!"
Kal Yafai (unbeaten flyweight): "One of the worst decisions I've ever seen. Disgusting."
Gamal Yafai (Commonwealth super-bantamweight champion): "Wow. The Russian didn't even win a round for me."
Never seen anything like that. I don't even know the guy and I'm angry for him.
Gary Lockett
Tommy McCarthy (unbeaten cruiserweight): "Levit on fire. I smell a rat! Levit literally punched him all over the ring."
Gary Lockett (trainer): "Absolutely disgraceful decision - Levit p***** that. Never seen anything like that. I don't even know the guy and I'm angry for him. Absolutely devastating for him."
Tom Farrell (unbeaten super-lightweight): "Terrible decision, that. The Kazakh has been robbed of a gold medal there."
The Olympic boxing tournament climaxes on Sunday with the men's flyweight, light-welterweight and super-heavyweight finals alongside the women's middleweight gold medal bout.
Katherine Grainger has described her silver in Rio as the "adversity medal" after defying the odds to become Britain's most decorated female Olympian.
The 40-year-old has now medalled at five Olympic Games, claiming silvers at Sydney 2000, Athens 2004 and Beijing 2008, and winning gold at London 2012 before adding to her medal haul in Rio.
Grainger took a break from rowing after London 2012 only to return to the sport two years later with a view to reaching the Rio Olympics.
But Grainger and double sculls partner Vicky Thornley only had their spot at Rio confirmed six weeks before the Games, making the task facing the pair even harder.
"It was more than a distraction because if you don't know you are going to an Olympics then it's quite hard to focus on it to some extent," Grainger told Tuesday's Sportswomen show on Sky Sports News HQ live from Rio.
Anna Watkins (R) and Grainger celebrate winning gold at London 2012
"I knew there was going to be a lot of physical and mental challenges coming back to being a full-time athlete and getting myself back to where I needed to be - and my standards and expectations were higher than they have ever been.
"The first year was tough but this last year was also tough because of the uncertainty and the selection issues - I didn't know what boat I was going to be in or if I was even going to be in a boat.
"This medal was the adversity medal. It was the hardest and the toughest one to keep believing that it might be possible to come back and win."
Olympic champion Nicola Adams is guaranteed at least a bronze medal after reaching the semi-finals of the women's flyweight competition at the Rio Olympics.
The 33-year-old Leeds boxer has already secured another medal after picking up a unanimous decision win in her opening bout and will next face Cancan Ren, the Chinese opponent she defeated in the London 2012 final.
Adams benefited from a bye in the opening round, but was made to work for a quarter-final win over Ukrainian Tetyana Kob as she emerged victorious with scores of 39-37 39-37 and 40-36.
During a scrappy contest, Adam offered the cleaner work with her accurate right hand, although she was forced to withstand a late assault from Kob.
The 2012 champion secured another bout with Cancan Ren
Adams, who was the final Team GB boxer to appear at the Games, told theBBC: "It's a massive difference.
"Once you get that first fight out of the way, you get the ring rust off and get a feel for the ring. It was just nice to get that one out of the way - and I've sealed a medal.
"I wasn't at my best in there but I am sure to improve as the days go on.
"I've been so eager to get in the ring. I've been watching the lads going out boxing, I've watched Savannah [Marshall] go out and box and all I've wanted to do is get in the ring."
Britain's Jack Burnell was left fuming and perplexed after being disqualified from the men's open water swimming when in medal contention.
The 23-year-old was in the mix at the end of the 10-kilometres race but was denied in the frantic finale.
Initially he was in a photo finish for third, behind winner Ferry Weertman of Holland, before being demoted to fifth and then disqualified altogether for a second caution from race officials.
The Loughborough swimmer, who was fifth in last year's World Championships, said: "It was an absolute joke, the whole thing from start to finish.
"You've got the best guys in the world out here, who have trained for four years, put a lot of hard work into this.
"This is the pinnacle of our sport and it's ruined by a couple of judges who want to stick their nose in, just because they want something to do.
Burnell competes with other swimmers in the Men's 10km Marathon at Fort Copacabana
"They want to be seen to be like they're doing something. Just let the guys race. It's an absolute outrage.
"There were yellow cards left, right and centre. The first yellow card I got, there was nobody either side of me.
"I couldn't physically have touched anybody, even if I had had six-foot long arms. And he gives me a yellow card.
"I just laughed at the guy as I was swimming. I looked at him and shook my head. He just nodded his head and showed me the yellow card. They just want to be seen to be doing something.
"This is unbelievable, considering how much work these guys put in, for four years, including myself - and it all gets thrown away just by some judge who wants to stick his oar in."
Burnell was furious after the race finished, describing his disqualification as a "joke"
Open water swimming is notoriously rough and often sees tugs of limbs, clashes of elbows and the occasional punch.
Weertman won gold in one hour, 52 minutes and 59.8 seconds. Greece's Spiros Gianniotis was second in the same time and Burnell was one of three swimmers just 2.42 seconds behind them.
France's Mac-Antoine Olivier was ultimately awarded bronze ahead of Zu Lijun of China, with Burnell left empty handed.
Defending Olympic champion Oussama Mellouli of Tunisia was 12th, 6.3secs behind, despite Burnell alleging he impeded his progress.
Burnell was angry with 2012 Olympic champion Oussama Mellouli's conduct during the race
The Brit added: "The guy that should've got disqualified is the guy that stopped me, Mellouli. He grabbed my leg.
"He was holding my leg not for one, two, three, but for four or five strokes, so I had to turn round to try to get him off. What am I meant to do?
"In that line, I'm thinking 'this is brilliant, this is perfect for me'. We're all at top speed and I'm stopped dead. I'm one of the fastest finishers in there.
"He was yellow carded for that, which stopped me winning, but I was disqualified for trying to get him off to try to win the race. Explain that to me. Absolutely outrageous.
"There's an appeals process, but it will mean nothing. It's never changed anything in the sport.
Dutch gold medallist Ferry Weertman (centre), second-placed Spiros Gianniotis (left) of Greece and French bronze winner Marc-Antoine Olivier on the podium
"Imagine this happens in the (football) World Cup final and the referee gives the goalie a yellow card for standing there. That is how ridiculous this is.
"A referee should not be there unless there is something clearly wrong. They always want to be seen to be doing something.
"On the Olympic stage, what do they want to do? Do they want to get on telly to show a yellow card? To show their family back home that they're doing something? It's absolutely ridiculous."
Usain Bolt began the latest leg of his 'triple triple' bid with the easiest of victories in his 200m heat in Rio.
The Jamaican already has the 100m title in the bag as he aims to win three sprint golds for the third successive Olympics, and he finished at jogging pace on his way to first place in the ninth of 10 200m heats on Tuesday.
Bolt's time of 20.28 seconds was more than a second slower than the 19.19 world record he has his sights on beating by the time the event ends on Thursday.
But he said afterwards: "I didn't really run that hard. I know how to run a 200m. Tomorrow [in the semi-finals] I will show much better progress because I will have to run faster, so I'm looking forward to that.
"Most of the young guys always run fast in the heats, but to win is the key thing because you get a better semi-final.
"I'll have enough rest and enough energy to definitely try [for the world record]. But we will see tomorrow how it goes."
Bolt's major rivals, including Justin Gatlin, made it through safely along with all three British competitors: team captain Adam Gemili clocked 20.20, Nethaneel Mitchell-Blake 20.24, while Danny Talbot equalled his personal best of 20.27.
Becky James won silver and Katy Marchant took bronze in the Olympic women's individual sprint at Rio 2016.
James was beaten 2-0 in the gold-medal final by Germany's Kristina Vogel, while Marchant defeated the Netherlands' Elis Ligtlee 2-0 in the third-place play-off.
James' progression to the final rounded off an excellent week of racing in which she also won silver in the keirin and re-announced herself as one of the best sprinters in the world following two years of injury and illness.
Marchant, meanwhile, claimed her first Olympic medal and in doing so ensured every member of Britain's Olympic track team had visited the podium in Rio.
James said: "I couldn't ask for much more. A year ago I was in a training camp in Valencia and it was my first one back [from injury] and I was so off the pace.
"If I could have seen myself now back then, I would never had expected this. It's a good thing to look back on. I've just felt incredible being here and I'm really, really happy with how I raced."
Both riders breezed into the semi-finals with 2-0 wins in the best-of-three quarter-finals and although James secured another 2-0 to beat Ligtlee in the semis, Marchant fell to a 2-0 defeat to Vogel.
Marchant secured a 2-0 triumph over Ligtlee in the bronze final in a photo finish in the second heat, but James was unable to trouble a dominant Vogel.
Giles Scott won GB's 17th gold in the men's finn sailing on Tuesday as Hannah Mills and Saskia Clark guaranteed another will follow.
Scott needed only to finish the final race of the competition to secure gold and a fifth straight British success in the event following Sir Ben Ainslie's hat-trick of titles and Iain Percy's 2000 win.
And the 29-year-old obliged with a second-placed finish behind United States sailor Caleb Paine.
Paine's victory was good enough to earn him a bronze medal, with silver going to Slovenia's Vasilij Zbogar.
Wednesday's women's 470 medal race will now be a lap of honour for Mills and Clark, meanwhile, after they finished the day with an unassailable lead.
The British pair are 20 points better off than their nearest rivals - New Zealand's Jo Aleh and Olivia Pownie - and are guaranteed to go one better than their silver-medal finish in London four years ago.
Hannah Mills (helm) and Saskia Clark of Team GB are guaranteed gold in the women's 470 class sailing
Ireland's Annalise Murphy earlier won a silver medal in the women's laser radial event, four years after she finished fourth in London.
Murphy told RTE: "I don't know whether I'm laughing or crying, I was just so happy with how I sailed this week and that last race I just put everything together really well. I'm over the moon."
Amy Tinkler and Nile Wilson took Great Britain's gymnastics medal tally to seven with bronze medals on day eleven at Rio 2016.
Tinkler, the youngest member of the Team GB squad at Rio 2016, took a third place in the women's gymnastics floor exercise and was followed a few moments later by Wilson's bronze on the men's high bar.
Tinkler, 16, took to the floor against the brilliant Simone Biles and while it was the American who took her fourth gold medal of the Games, Tinkler produced a wonderful performance to take third just four years after watching on as a 12-year-old at London 2012.
Biles, already winner of a gold in the team and individual all-round events, added to the vault gold and beam bronze she took a couple of days ago with a sensational routine that saw her awarded a brilliant score of 15.966.
Tinkler produced a superb performance to claim a fantastic bronze medal
But for Tinkler, she went one better than the fourth place GB took in the women's all-round event last weekend with a routine score of 14.933 that saw her become Britain's second female individual gymnastics Olympic medalist.
Another American, Alexandra Raisman, took the silver medal to complete an American 1-2 before Wilson took to the floor in the spectacular high bar.
Going third of the eight contenders, he produced a score of 15.466 after Germany's Fabian Hambuechen had racked up 15.766 with the first performance which was to be good enough to claim gold.
Nile Wilson won GB's seventh medal of the gymnastics competitions with bronze in the high bar
Wilson had the daunting task of following the gold medalist of London 2012 Epke Zonderland, but the Dutchman suffered a nasty fall to ruin his hopes of defending his title.
Wilson, 20, from Leeds, watched on as nobody was able to overtake him until America's Danell Leyva, with the last routine of the final, pipped him to silver with a score of 15.500.
Wilson and Tinkler add to the two golds (floor and pommel horse) and one bronze medal (individual all-round) won by Max Whitlock, a silver for Louis Smith (pommel horse), a bronze in the men's all-round team and a brilliant silver for Bryony Page in trampoline.
